川南寒武系筇竹寺组拉张槽边缘型页岩气地质特征及富集高产地质因素研究  

Geological characteristics of shale gas and research on enrichment and high production geological factors at edge of tensional trough of Cambrian Qiongzhusi Formation in southern Sichuan

作　　者：葛忠伟[1] 史洪亮[1] 周桦 王鹏[1] 张全林 GE Zhongwei;SHI Hongliang;ZHOU Hua;WANG Peng;ZHANG Quanlin(SINOPEC Southwest China Oil&Gas Company,Chengdu 610041,China;Research Institute of Exploration and Development,SINOPEC Southwest China Oil&Gas Company,Chengdu 610041,China)

机构地区：[1]中国石化西南油气分公司,成都610041 [2]中国石化西南油气分公司勘探开发研究院,成都610041

出　　处：《非常规油气》2025年第1期19-29,共11页Unconventional Oil & Gas

基　　金：“十三五”国家科技重大专项“南方海相页岩气勘探潜力与目标评价”(2017ZX05036-003)。

摘　　要：四川盆地寒武系筇竹寺组为区域性烃源层系,是龙王庙组和灯影组等气藏主要供烃地层。近年来寒武系的勘探表明,除作为烃源层具有良好的生烃能力之外,其本身也是一套优质的非常规储集层,并且通过测试获得了高产工业气流。针对该套地层受沉积时期构造运动影响,盆地不同区域、不同构造单元成藏特征差异较大,油气富集规律不统一的问题,基于研究区所处构造位置,分析认为研究区所在的拉张槽边缘筇竹寺组稳定发育厚大的含气储层,保存条件良好,与龙马溪组页岩具有相似的地质特征,进而总结了影响筇竹寺组页岩气富集高产的地质因素。这些因素包括:1)储层厚度大、储层品质好是富集的地质基础;2)地压系数高,顶底板封盖条件好,保存条件良好是富集的重要保障;3)脆性好、地应力相对低,为储层改造提供了良好的工程地质条件;4)良好的成藏配置条件为油气富集起到了重要作用;5)适度发育的微裂缝,通过改造形成复杂缝网且沟通天然裂缝是高产的关键。该认识对指导该区稳步推进勘探开发具有重要指导意义。Qiongzhusi Formation of the Cambrian in the southern Sichuan Basin is a regional hydrocarbon source rock series,which is the main source rock for gas reservoirs such as Longwangmiao Formation and Dengying Formation.In recent years,the exploration showed that the Cambrian system is a source layer with good hydrocarbon generation ability and a high-quality unconventional reservoir.In addition,the high production industrial gas flow was obtained through testing.However,the comparison reveals that hydrocarbon accumulation characteristics vary significantly,and oil and gas enrichment patterns are inconsistent across different regions and structural units of the basin because tectonic movements influence the hydrocarbon source rock series during the sedimentary period.Based on the structural location of the research area,the authors believed that the research area is located at the edge of the tensional trough and Qiongzhusi Formation is a stable and thick gas-bearing reservoir with good preservation conditions,which has similar geological characteristics to Longmaxi Formation shale.Furthermore,the geological factors affecting the high production of gas enrichment in the Qiongzhusi Formation shale are summarized as follows:1)The large thickness and good quality of the reservoir are the geological basis for enrichment;2)High formation pressure coefficient,good sealing conditions for the top and bottom plates,and good storage conditions are important guarantees for enrichment;3)The good brittleness and the relatively low geostress provide favorable engineering geological conditions for reservoir stimulation;4)Good reservoir configuration conditions play an important role in oil and gas enrichment;5)Moderately developed microfractures are transformed into complex fracture networks and communicate with natural fractures through stimulation,which is the key to high production.This understanding has important guiding significance for steadily promoting exploration and development in the area.

关 键 词：川南寒武系 筇竹寺组 拉张槽边缘型 页岩气 地质特征 富集高产 

分 类 号：TE122[石油与天然气工程—油气勘探]